IRF2013 is part of a prestigious series of conferences that was initiated in 1999, in

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2 of computer based techniques, as well as laser-optics methods, nanotechnologies and nanomaterials, among many other technological advances, added new dimension and perspectives to minimize or prevent catastrophic failures of engineering systems, structures and components. This volume contains the extendedabstracts of the 380 papers accepted for presentation in the IRF h International Conference on In tegrity, Reliability and fa ilure held in Funchal/Portugal, June The book is complemented by an accompanying CD-ROM containing the full length papers. IRF2013 is part of a prestigious series of conferences that was initiated in 1999, in Porto (Portugal), coordinated by the International Scientific Commiltee on Mechanics and Materiais in Design. The conference altracted over 300 participants with 380 accepted submissions from 45 different countries around the world. These papers were presented in June 23-27, 2013 in the magnificent city of Funchal, Madeira, and the conference themes focused on nanoengineering, computational and structural mechanics, micromechanics, experimental mechanics, advanced materiais, thermoftuid systems and case studies, among other engineering topics.

3 799 RO I R03 R RI I SI3 815 RI R EDlTORS PREFACE As the engineering community continues lo cross the boundaries Df known practices, materiais and manufacturing techniques into lhe frontiers af new functional materiais, environrnents and applications. the opportunities for catastrophic failures will inevitably incrcase. Ir our knowledge af how to engineer systems, sltuctures and components to minimize or prevent catastrophic failure is to keep pile e with modem manufacturing technologies, the demanding applications, and the intolerance af a safety conscious society, we musl continue aur efforls to develop and use superior materiais, apply reliable analytical techniques and validate lhese with sound experimental tools. lt is with this in mind that lhis series of conferences was organised. The objectives of this gathering are to provi de a forum for the discussion and dissemination of recent advances in assessing the integrity, reliabilily and failure of engineering structurcs, components, and assemblies, foster research in these arcas, and promote international cooperation arnong scientists and engineers in the field. The goal is to enable concerncd researchers and scientists from ali over the world to exchange ideas on mechanics, materiais and design as Ihey relate lo system integrily and reliabilily. This fourth intemational conference, which is sponsored by the Univcrsity Df Porto, lhe University oftoronto and the University of Madeira, is part ofa prestigious series of Integrity Reliability and Failure conferences coordinated by the Intemational Scientific Committee on Mechanics and Materiais in Design. The conference atlractcd over 300 participants with 380 accepted submissions [rom 45 different countries around lhe world. These papers were presenled in June 23-27, 2013 in lhe magnificenl cily of Funchal, Madeira. The confcrence themcs which address integrity, reliability and failurc focused on Analytical and Numerical tools, Testing and Diagnostics, Surfacc and Interface Engineering, Sensors and Instrumentation, Tribology, Mechanical Design and Prototyping, Modes of Failure, Composite Materiais, Nanotcchnologies and Nanornaterials, Biomechanícs, Energy and Thenno-Fluid Systems, Impact and Crashworthiness and Case Studies. We are particularly indebted lo the authors and speeial gucsls for their plcnary lectures and presentations. Each of lhe more than 380 contributions offered opportunities for thorough discussions with the authors. We acknowledge ali of the participants, who contributed with innovations, new research approaches, novel modeling and simulation efforts, and invaluable criticai commems. We are also indebled to lhe outstanding plcnary lecturers who highlighled the conference thcrnes with their contributions: Professor Xiong Zhang (Tsinghua University, P. R. China), Professor E.A. Elsayed (Rutgers University, USA) and Professor Norilsugu Umehra (Nagoya University, Japan). We also take this opportunity to thank lhe members of lhe Intemational Scientific Committee and reviewers for thcir time and effort. Last but by no means least, we offer our sincere gratitudc to the symposia organisers [ar thcir contribution to the success of the cvent and lhe local organising commíttec for attending to many aspeels oflhe conference dcmands. For ali ofthem, wc are truly very grateful. Shaker A. Meguid alld J.F. Silva Gomes Fundlal! Madeira, June xxvii

10 /NTEGRlTY, RELlABILlTYAND FAILURE PAPER REF: 4090 I f THERMAL ANAL YSIS OF WOOD-STEEL HYBRID CONSTRUCTION E.M.M. Fonscca(*', H.I\'I.E. Rumos, H.J.G. Silva, D.R.S.M. Ferreira Polytcchnic Inslitulc af Bragança, Bragança, Portugal (* I ABSTRACT The main objective of this work is to provi de the thermal analysis in wood-steel hybrid elemenls for building constructions under fire conditions. A transient thennal analysis \Vith nonlinear material behaviour will be solved with ANSYS programo The use of wood-steel hybrid models has major advantages as increascd fire resistance, and improvcd high strength. Wood is a Iightweight material, easy to assemble, great architectural features, thermal and acoustic characteristics. However, lhe high vulnerabílity af wooden clements under fire, involves evaluating their behaviour accurately. Its physical behaviour is conditioned by the charring layer fonnation, which may allow the insulation into the structural scction. The steel is a curreot use material allowing high structural strength. However, steel is a 000- combustible material, aod when compared with wood is a very good conductor of heat. Consequently, the unprotectcd sections of steel under fire quickly heats, and the fire resistance decreases considerably. The numerical modelling of thesc hybrid models, providing the analysis at high temperatures, is complicated due to the heat produced, to form a layer of carbonizalion surrounding lhe wood, and also the properties of both materiais are nontincar. Using a computer model, it wili become possible to calculate lhe fire resistance of these hybrid elements, an important parameter for safety and design rules. KeYlVords: wood-stcel, hybrid construction, tire, numerical model. rch INTROOUCTION The use of hybrid materiais could increase the structural integrity of the construction elements. Steel material has many advantages over wood elements, strength, stabilily, resistance lo woodwonn, among olhers. Steel is incombustible and most of lhe times it can full recover strenglh afier fire but, steel material conducts heat extremely well, (lan et ai, 2002), (Barbosa et ai, 2012). Wood is a renewable resouree, rceently attraeted by public attention. Wood is a natural material with good structural characteristics. The wood when exposed to accidental actions, such as fire conditions, has a surroudding charring depth. However, lhis layer can delay the heating process lo the core section, acting as an insulating. [n Ihi, work wood-stcel hybrid pro files subjected to fire are presented lo verify the best solution used in design construction. The complexity of tbis analysis nccds some numerical techniques with high performance, which is the case of the fioite element analysis.!sis. ling. RESULTS ANO CONCLUSIONS The thermal properties of steel and wood are function of the temperature and should be determined from the Eurocode 3 (CEN 1995) and Eurocode 5 (CEN 2004), as represented in figure I. 20/3 S,"IIIP _18: Safely of IVooden Struclllres 659

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